make the farming mod optional

depends.txt

@@ -1,7 +1,6 @@
 default
 subterrane
-farming
-harderstone?
+farming?
 cottages?
 bucket?
 dynamic_liquid?

plants.lua

@@ -142,6 +142,8 @@ local grow_underground_plant = function(pos, node)
 end
 
 dfcaverns.register_grow_abm = function(names, interval, chance)
+
+	if minetest.get_modpath("farming") then
 		minetest.register_abm({
 			nodenames = names,
 			interval = interval,
@@ -157,6 +159,7 @@ dfcaverns.register_grow_abm = function(names, interval, chance)
 				grow_underground_plant(pos, node)
 			end
 		})
+	end
 	
 	minetest.register_abm({
 		nodenames = names,

textures/license.txt

@@ -20,4 +20,4 @@ dfcaverns_flour - derived from farming
 dfcaverns_bread - derived from farming
 dfcaverns_pig_tail_thread - copied from farming
 dfcaverns_sugar - derived from farming
-
+dfcaverns_spore_tree_spores, dfcaverns_cave_wheat_seed, dfcaverns_pig_tail_seed - all derived from farming wheat seed

trees/spore_tree.lua

@@ -267,7 +267,7 @@ minetest.register_abm{
 			size = 10,
 			collisiondetection = false,
 			vertical = false,
-			texture = "farming_wheat_seed.png",
+			texture = "dfcaverns_spore_tree_spores.png",
 		})
 		
 	end,